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Yes, we are going to need a little more information on this one.
What exactly are you doing that won't allow you to install something?
What application are you trying to install?
What file type is it, what extension does it have, where did you get it from...etc.?

mac: a waterproof raincoat made of rubberized fabric
MAC: a data communication protocol sub-layer, also known as the Media Access Control
Mac: a brand name which covers several lines of personal computers designed, developed, and marketed by Apple Inc.

If that doesn't work, download MainMenu and clean out all the user caches, deep clean the system, clean font cache. Restart. After emptying the caches, the restart will be longer than usual so don't worry if you notice it is taking a while longer to reboot.

If that doesn't work, create a new user account, log into that new one and use it, see if the problems persist in the new user account.

If not then it means that your usual user account has corrupted data in it. If the problem reproduces in the new account as well, then this means the problem is system-wide.

I know this sounds silly, but you do know that you have to double click a .dmg to open it, don't you? Then you have just opened a disk image, and you will see a disk mount on your desktop. Open that and you will see the application inside. Double click to launch it.

If you like the app, you can drag it to you Applications folder, close the .dmg and trash it. From then on, you can launch it by opening your Applications folder and double clicking it there.

If you REALLY like the program, you can drag it onto your Dock, and then a single click there will do the trick to launch it.

i don't know how it happened but somehow my system profiler has gone missing. i've done all those things that i was told to do but none of the options have worked. it all started when i tried to download a bluetooth firmware updater. after the download was complete, i opened the disk that it downloaded to the desktop and i noticed that the icon of the file contained inside the disk, entitled BTFWUpdate.1.2.1.pkg, was a little white piece of paper instead of being the little brown box with the yellow square inside of it. when i clicked on it, a dialog box popped up which asked me to choose a program to open the file with. i don't know what's going on.

also, if someone could please help with my bluetooth, i'd greatly appreciate it.